<template>
	<view>
		<!-- 使用自定义的搜索组件 -->
		<!-- <my-search :bgcolor="'pink'" :radius="3"></my-search> --> 
		<my-search @click="gotoSearch"></my-search>
		
		<view class="scroll-view-container">
			<!-- 左侧的滑动区域 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
				<block v-for="(item, i) in cateList" :key="i">
					<view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
				</block>
			</scroll-view>
			<!-- 右侧的滑动区域 -->
			<scroll-view scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
				<view class="cate-1v2" v-for="(item2, i2) in cateLevel2" :key="i2">
					<!-- 二级分类的标题 -->
					<view class="cate-1v2-title">/ {{item2.cat_name}} /</view>
					<!-- 当前二级分类下的三级标题 -->
					<view class="cate-1v3-list">
						<!-- 三级分类的Item项 -->
						<view class="cate-1v3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
							<!-- 三级分类的图片 -->
							<image :src="item3.cat_icon"></image>
							<!-- 三级分类的文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				// 当前设备可用的高度
				wh: 0,
				cateList: [],
				active: 0,
				// 二级分类的列表
				cateLevel2: [],
				scrollTop: 0
			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight - 50
			
			this.getCateList()
		},
		methods: {
				// 获取分类列表的数据
				async getCateList() {
					const {data: res} = await uni.$http.get('/api/public/v1/categories')
					if(res.meta.status !== 200) return uni.$showMsg()
					this.cateList = res.message
					
					
					// 为二级分类赋值
					this.cateLevel2 = res.message[0].children
				},
				activeChanged(i) {
					this.active = i
					
					// 重新为二级分类赋值
					this.cateLevel2 = this.cateList[i].children
					
					this.scrollTop = this.scrollTop === 0 ? 1 : 0
				},
				// 跳转到商品列表页面
				gotoGoodsList(item) {
					uni.navigateTo({
						url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
					})
				},
				gotoSearch() {
					uni.navigateTo({
						url: '/subpkg/search/search'
					})
				}
		}
	}
</script>

<style lang="scss">
.scroll-view-container {
	display: flex;
	
	
	.left-scroll-view {
		width: 120px;
		
		
		.left-scroll-view-item {
			background-color: #F7F7F7;
			line-height: 60px;
			text-align: center;
			font-size: 12px;
			
			
			&.active {
				background-color: #FFFFFF;
				position: relative;
				
				
				&::before {
					content: '';
					display: block;
					width: 3px;
					height: 30px;
					background-color: #C00000;
					position: absolute;
					top: 50%;
					left: 0;
					transform: translateY(-50%);
				}
			}
		}
	}
}


.cate-1v2-title {
	font-size: 12px;
	font-weight: bold;
	text-align: center;
	padding: 15px 0;
}


.cate-1v3-list {
	display: flex;
	flex-wrap: wrap;
	
	
	.cate-1v3-item {
		width: 33.33%;
		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;
		margin-bottom: 10px;
		
		image {
			width: 60px;
			height: 60px;
		}
		text {
			font-size: 12px;
		}
	}
}
</style>
